Agreed, however I do think Machida's Karate base adds much more to this than you have indicated.
That would be because IMO the karate base that Machida has is not something that I believe is effective in MMA, now I know what everyone will say..''how can you say that considering machida is the champion'' well because of what I said before about machida's timing and distancing, if he didnt have these I dont think his style would be very effective, I mean his kicks are quick but because of that way he throws them they lack power compared to the muay thai kick, his hands are quite low in his karate stance, when he is at a distance throwing his shots this in fine but even in the Evans fight when Evans got inside he made machida pay until machida could back up again, this is a weakness that will be exploited.
The point being though is that MACHIDA makes karate work in the octagon, it can hardly be used as a template for MMA like Muay thai and boxing are since unless your machida your proberly going to find your going to come up short.